What is a spherical mirror？
2021-06-28(811)Views
What is a spherical mirror?
1. Basic concepts
(1) Definition: The mirror surface whose reflecting surface is a part of the spherical surface is called a spherical mirror (a part of the spherical shell---spherical crown).
(2) Types: Spherical mirrors are divided into two types: convex mirrors and concave mirrors.
2. Convex mirror: A spherical mirror that uses the inner side of the sphere as a reflective surface is called a convex mirror.
(three) other
1. Vertex: The center point O of the mirror is called the vertex of the mirror.2. Center: The center C of the sphere is called the mirror center.
3. Main axis: the dot-dash line connecting the vertex O and the center of the mirror.
4. Focus: The paraxial light parallel to the main axis hits the sphere, and the reflected light converges at a point on the main axis. This point is called the focal point and is represented by the letter F.
5. Focal length: The distance from the focal point to the vertex is called the focal length, which is represented by the letter f, that is, the focal length of the concave mirror is equal to half of the spherical radius.
6. Optical characteristics of concave mirror:
(1) The reflection phenomenon on the concave mirror all obeys the light reflection law.
(2) After the rays parallel to the main axis are reflected by the concave mirror, the reflected rays converge at the focal point. The focal point of the concave mirror is the convergence point of the actual light, so it is the real focal point.
(3) The concave mirror has a convergent effect on the light. The smaller the focal length, the greater the converging power.(4) Four special rays: The rays parallel to the main axis are reflected by the concave mirror and converge at the focal point; the incident rays passing through the focal point are reflected and parallel to the main axis; the incident rays passing through the center of the sphere return along the original path; the incident rays from the vertex are incident The light and its reflected light are symmetrical about the main axis.
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